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/**
* Copyright 2013 Joan Zapata
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.joanzapata.android;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.text.util.Linkify;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AlphaAnimation;
import android.widget.ImageView;
import android.widget.TextView;
import com.squareup.picasso.Picasso;
import com.squareup.picasso.RequestBuilder;
/**
* Allows an abstraction of the ViewHolder pattern.
*
*
* Usage
*
*
*/
public class BaseAdapterHelper {
/** Views indexed with their IDs */
private final SparseArray views;
private final Context context;
private View convertView;
private BaseAdapterHelper(Context context, ViewGroup parent, int layoutId) {
this.context = context;
this.views = new SparseArray();
convertView = LayoutInflater.from(context) //
.inflate(layoutId, parent, false);
convertView.setTag(this);
}
/**
* This method is the only entry point to get a BaseAdapterHelper.
* @param context The current context.
* @param convertView the convertView arg passed to the getView() method.
* @param parent the parent arg passed to the getView() method.
* @return A BaseAdapterHelper instance.
*/
public static BaseAdapterHelper get(Context context, View convertView, ViewGroup parent, int layoutId) {
if (convertView == null) {
return new BaseAdapterHelper(context, parent, layoutId);
}
return (BaseAdapterHelper) convertView.getTag();
}
/**
* This method allows you to retrieve a view and perform custom
* operations on it, not covered by the BaseAdapterHelper.
* If you think it's a common use case, please consider creating
* a new issue at https://github.com/JoanZapata/base-adapter-helper/issues.
* @param viewId The id of the view you want to retrieve.
*/
public T getView(int viewId) {
return retrieveView(viewId);
}
/**
* Will set the text of a TextView.
* @param viewId The view id.
* @param value The text to put in the text view.
* @return The BaseAdapterHelper for chaining.
*/
public BaseAdapterHelper setText(int viewId, String value) {
TextView view = retrieveView(viewId);
view.setText(value);
return this;
}
/**
* Will set the image of an ImageView from a resource id.
* @param viewId The view id.
* @param imageResId The image resource id.
* @return The BaseAdapterHelper for chaining.
*/
public BaseAdapterHelper setImageResource(int viewId, int imageResId) {
ImageView view = retrieveView(viewId);
view.setImageResource(imageResId);
return this;
}
/**
* Will set the image of an ImageView from a drawable.
* @param viewId The view id.
* @param drawable The image drawable.
* @return The BaseAdapterHelper for chaining.
*/
public BaseAdapterHelper setImageDrawable(int viewId, Drawable drawable) {
ImageView view = retrieveView(viewId);
view.setImageDrawable(drawable);
return this;
}
/**
* Will download an image from a URL and put it in an ImageView.
* It uses Square's Picasso library to download the image asynchronously and put the result into the ImageView.
* Picasso manages recycling of views in a ListView.
* If you need more control over the Picasso settings, use {BaseAdapterHelper#setImageBuilder}.
* @param viewId The view id.
* @param imageUrl The image URL.
* @return The BaseAdapterHelper for chaining.
*/
public BaseAdapterHelper setImageUrl(int viewId, String imageUrl) {
ImageView view = retrieveView(viewId);
Picasso.with(context).load(imageUrl).into(view);
return this;
}
/**
* Will download an image from a URL and put it in an ImageView.
* @param viewId The view id.
* @param requestBuilder The Picasso request builder. (e.g. Picasso.with(context).load(imageUrl))
* @return The BaseAdapterHelper for chaining.
*/
public BaseAdapterHelper setImageBuilder(int viewId, RequestBuilder requestBuilder) {
ImageView view = retrieveView(viewId);
requestBuilder.into(view);
return this;
}
/** Add an action to set the image of an image view. Can be called multiple times. */
public BaseAdapterHelper setImageBitmap(int viewId, Bitmap bitmap) {
ImageView view = retrieveView(viewId);
view.setImageBitmap(bitmap);
return this;
}
/**
* Add an action to set the alpha of a view. Can be called multiple times.
* Alpha between 0-1.
*/
public BaseAdapterHelper setAlpha(int viewId, float value) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
retrieveView(viewId).setAlpha(value);
} else {
// Pre-honeycomb hack to set Alpha value
AlphaAnimation alpha = new AlphaAnimation(value, value);
alpha.setDuration(0);
alpha.setFillAfter(true);
retrieveView(viewId).startAnimation(alpha);
}
return this;
}
/**
* Set a view visibility to VISIBLE (true) or GONE (false).
* @param viewId The view id.
* @param visible True for VISIBLE, false for GONE.
* @return The BaseAdapterHelper for chaining.
*/
public BaseAdapterHelper setVisible(int viewId, boolean visible) {
ImageView view = retrieveView(viewId);
view.setVisibility(visible ? View.VISIBLE : View.GONE);
return this;
}
/**
* Add links into a TextView.
* @param viewId The id of the TextView to linkify.
* @return The BaseAdapterHelper for chaining.
*/
public BaseAdapterHelper linkify(int viewId) {
TextView view = retrieveView(viewId);
Linkify.addLinks(view, Linkify.ALL);
return this;
}
/** Retrieve the convertView */
public View getView() {
return convertView;
}
@SuppressWarnings("unchecked")
private T retrieveView(int viewId) {
View view = views.get(viewId);
if (view == null) {
view = convertView.findViewById(viewId);
views.put(viewId, view);
}
return (T) view;
}
}
